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10 Cards in this Set
- Front
- Back
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osmosis |
passive transport of water via aquaporins driving force is osmotic pressure |
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osmotic pressure |
pressure necessary to stop net mvmnt of water across membrane water move from LOW osmotic pressure to HIGH osmotic pressure depends on number of particles dissolved in solution its a colligative property |
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Osmolarity |
Osm/L solute particles in a solution osmolarity of blood is 290 mOsm/L 1 mOsm/L exerts 19 mmHg of osmotic pressure |
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Osmolality |
used more often bc its independant of temp and pressure its mOsm/kg human blood has osmolality of 290 mOsm/kg also dependant on number of particles in sol'n water move low to high osmolality |
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isosmotic |
if two solutions contain same number of particles and exert same osmotic pressure |
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hyperosmotic |
solution with higher osmolality and osmotic pressure (means it has more particles in water) |
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hyposmotic |
solution with lower osmolality and lower osmotic pressure of the two |
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sweating/lack of water change osmolality |
dehydration will decrease volume and increase osmolality of the ECF (so its little water and high solute outside of cell) so what will the cell do? we need water! cuz ECF is hypertonic to ICF. water will move out of cell until equilibr from soln with low osmolal (inside) to high osmolal (outside) and the cell will shrink |
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overhydration caused by incr water intake would result in increased volume and decreased osmolality of ECF |
so when the cell is in a hypotonic solution water will enter the cell and the cell will swell |
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examples of one dissociable particle |
Na+ K+ Cl- HCO3- Ca2+ phosphate (po4 3-) NH4+ Glucose, sucrose, starch urea albumin |
